What are the alternatives to using iframes for loading content in PHP applications?

Using iframes for loading content in PHP applications can lead to issues with SEO, accessibility, and performance. To avoid these problems, an alternative approach is to use PHP include or require functions to load content from separate files directly into the main page. This method allows for better integration of content, improved SEO, and faster loading times.

<?php
// Include the content file directly into the main page
include 'content.php';
?>